Preparation of hydroxyl functionalized ACR and its application in PBT modification
Hydroxy-functionalized polyacrylate rubber particles(ACR-OH)were synthesized with micro-crosslinked poly-butyl acrylate(PBA)as a rubber core and methyl methacrylate-hydroxyethyl acrylate copolymer(HEA)as a shell through seed emulsion polymerization.ACR-OH was mixed with triglycidyl isocyanurate(TGIC)and then added into polybutylene terylene phthalate(PBT).Owing to the reactions occurring between the hydroxyl groups on the surface of ACR particles and epoxy groups in TGIC and between the epoxy groups in TGIC and hydroxyl end-group of PBT in the melt blending process,the modified PBT(PBT/TGIC/ACR-OH)gained the good compatibility between ACR and PBT.The effect of the addition of ACR-OH and TGIC on the impact strength and tensile strength of the modified PBT were investigated.The results indicated that the addition of ACR-OH effectively improved the toughness of PBT due to good compatibility.When the addition amounts of ACR-OH and TGIC were 20 and 2 phr,respectively,the impact strength of the modified PBT reached 20.45 kJ/m2,which was 8.4 times as high as that of pure PBT(2.43 kJ/m2).Moreover,with the help of multi-functional TGIC,the modified PBT exhibited both good toughness and good strength at addition amounts of ACR-OH and TGIC of 8 and 2 phr,respectively.Its impact strength and tensile strength reached 10.87 kJ/m2 and 42.1 MPa,respectively.
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